Recent content by queenidog

Wow! I didn't know that. thanks for the info. I have a bunch of the magnets I plan to use though, so they are easily replaceable. I have a Gauss meter to test them

Thanks Ivan for all your help. It's been informative. HOWEVER, everyone, I'm changing tactics. After achieving 1738 Gs with an EM taken from a relay and modifying the center rod, I find that this is JUST MARGINAL to move the player effectively. So, as Dave E. recommended once (and I was aware...

I have failed. I made another coil, with two layers and a metal core Not being able to determine how much was in each, I just winged it and wound what I thought was the same amount each time. NOT! Coil1 was 358 ohms and coil2 was 1180 ohms, or 149m and 492 m respectively. Total for the two...

Well I did answer this question before (maybe it was on the Enginerring forum) but here it is: The chess squares are 40mm across, the players (all custom made by me on a 3D printer) have bases 18mm across so they are 11 mm away from an edge. 2x11= 22 mm, 4mm extra to move the player between...

Thanks for good advice. I had not thought about a metal frame, actually but in looking at other EMs and even solenoids, most of them have metal frames. I can do that. Another experiment!

Wow! Good advice. Actually the nail in the photo was only used to hold the coil up and it was my intention to replace it with a piece that fit the dimensions of the bobbin. Today I'm winding another coil directly onto the metal rod. Good idea about the parallel coils. I will try that too...

UPDATE Jan23 I made a coil with #38 wire, spun on a bobbin I made on 3D printer, of size that would fit in my Chess game. I calculated 21,200 turns (I used a slow turning lathe to load the bobbin), measured 1600 ohms, which worked out to 666 meters of wire. I did not wind wire on metal core (I...

Because the layout is so large (because of the corexy mechanism), 2-3 mm acrylic plastic sags in the middle. I bought some 6mm plastic, doesn't sag but doesn't work. WAY too thick. So I went with aluminum sheet since it is paramagnetic and won't hold magnetism. Of all the products I tested...

I have a Scara arm that I will teach to play chess (using Swordfish engine) after I get my Phantom chess working.

It has to do with more complex chess moves like en passant, castleing and getting a Queen (by pawn reaching the other side). Remember too that if a black eats a white player, that position is now black, not white. Check out my webpage. I refer to the original Instructable which me and my...

That's what I thought at first, basically an array that gets updated on every move, but the Micromax code, written by others differentiates the two and so this differentiation must be maintained for the "supervisory code", the one that actually moves the players. The system uses a standard...

I can do that (concentrate the field). I do that with the players now. I will be using PWM in a sort of pulsed mode since the magnet only has to work when it is moving a player around.

That's the kind I have, 3 of them actually and they all have less magnetism than the small solenoid I had. So what's different? Gotta be the # of turns of wire. The EM shown takes about 1.5 A. Must be low resistance, big wires.

I have to differentiate between a white and black player so one has a South magnet, the other a north magnet. Which one gets selected depends on the polarity of the electromagnet: one way it picks up white, the other way black. A permanent magnet which DOES work well is static, unless I put in...

Gotcha. That's next on my list. I was hoping to "figure it out" before making a prototype as this Amazon purchase (the wire) was not cheap. I can see this very fine wire breaking halfway through the spin onto a bobbin. Swearing a lot comes next.